Propelling device for boats



Jan. 1, 1929.

A. BRUN PROPELLING DEVICE FOR BOATS Filed Aug. 5, 1926 sarai CHICAGO, ILLINOIS.

IPROIPELLENG DEVICE FOR BOATS.

Application filed August 5, 1926.

. against the water, the water is forced rearwardly without any relative slippage such as is had with ordinary screw propellers, and

the boat may be reversed and turned abruptly in a very small area.

@ther ob]e.cts and advantages of the invention will be evident to those skilled in the art upon a full understanding of the constr-uction, arrangement and operation of the parts incorporated in the propeller.

One embodiment of the invention is presented herein for the purpose of 'exemplilicw tion, but it will of course be understood that the invention is susceptible of embodiment in other structurally modified forms coming equally within the comprehensive scope of the appended claims.

In the drawing: f 1

Fig. 1 is a side view of the stern of a boat equipped with the propeller of the invention;

Fig. 2 is a rear'view of the stern of the saine boat;

Fig. 3 is a side view of the propeller;

Fig. a is a rear view of the propeller with the blade in its uppermost position;

Fig. 5 is a similar view with the blade in its lowermost position;

Fig. 6 is a horizontalsection through one of the two side reversing propellers, taken on the liner 6-6 of Fig. 1;

Fig. 7 is a vertical section through the same reversing propeller with the blade inits closed position; and

Fig. 8 is a similar section with the blade 1n its open position. v

It will be observed in the drawing that the propelling device includes three unitsa propeller 10 arranged beneath thestern of the boat for imparting forward movement, and two auxiliary reversing propellers 11 arranged at opposite sides of the boat near the stern for imparting rearward movement.

rlhe propeller 10 is set into an aperture 12 in the rear end of the keel 13, and operates from a pointj ust forwardly of the rudder "1a- L The propeller 10 includes a stationaryhousing 15 and a movable blade 16. IThe housing 15 is closed at its forward end, and is provided with a short upper wall 17 and a long lower wall 18 in rearwardly diverging relation to the wall 17. Thekupper and lower walls 17 Serial N0. 127,302.

and 18 preferably increase in width toward the rear ends thereof. rlhe blade 16 is pivoted on a horizontal axis 19 in the forward closed end of the housing, and extends rearwardly between the upper and lower walls 17 and 1S, terminating at a point rearwardly of the upper wall 17 and substantially even with the lower wall 18.

The blade 16 is provided along the side edges thereof with downwardly extending flanges 19; and the lower wall 18 of the housing beneath the blade is likewise provided along the side edges thereof with downward ly extending lianges 2O which lit closely with the flanges 19 but permit the latter to slide freely relative thereto. 'lhe flanges 26 are in turn provided along the lower edges thereof with flanges 21 which extendr upwardly along the outer sides of the flanges 19 of the blade and connect with the upper wall 17 of the housing; thus constituting side closuresV for the wedge-shaped space between the upper and lower wallsv 17 and 16 in which the blade 16 oscillatcs. f

The blade 16 is moved upwardly and downwardly about the axis 19 by means ofa link 22 which is pivoted at its lower end to a laterally elongated bracket 23 secured to the top of the blade rearwardly of the upper wall 17 ofthe housing. rllhe link 22 is pivoted at its upper end to a cross-head 2a which slides upwardly and downwardly in a forwardly ini clined gui deway 25 in the keel 13 and is reciprocatedby a rod 26 which extends at the same inclination through an aperture in the stern at the upper end of the guideway. The rod 26 is connected in any` suitable manner with the motor mounted within the hull.

1t will be understood from the foregoing that when the rod 26 isreciprocated the blade 16 oscillates upwardly and downwardly in unison therewith, and that the water in which the propeller is submerged is forced rearwardly; first from the tapering space between the blade 16 and the lower wall 18 and then from the tapering s ace between the blade 16 and the upper wal 17. All of the water pocketed in suoli spaces must necessarily leave the same rearwardly, as the iianges along the side edges of the blade and those along the side edges of the upper and lower walls effectively preclude the water from escaping along the sides. The stroke of the operating rod 26 is preferably adjusted in such a way as to prevent the blade 16 from coming into actual contact with either the upper or lower walls 17 and 18 of the housing.

lt will of course be appreciated that the propeller l0 is not capable of imparting any rearward movement to the boat, and the auxiliary reversing propellers l1 Vare consequently provided for that purpose. The propellers l1 are mounted in the sides `ot the hull, and are, when not in use, disposed flush with such sides 27.

Each of the reversing propellers ll consists of a blade 28 which is -pi-voted at its rear end on a substantially vertical axis 429. The blade 28 is provided along its upper and lower edges with -perpendicularly extending flanges 3() which increase in width toward the front end of the blade and slide in correspondingly shaped slots 3l formed in a housing 32 which is secured to the inner side of the hull opposite the blade 28 in such a way as to render the hull waterproof at that point. rlhe housing 32 is provided, intermediate the slots 3l with a wall 33 which is parallel to and substantially Hush `with the side 27 of the hull. Then the reversing propellers ll are not in use, the blade 28 oit' each is disposed flush with the side of the hull in close relation to the wall 33 of the housing, but when such propellers are being used, the blade 28 of each oscillates outwardly and inwardly7 causing the water entering the wedge-shaped space between the blade 28 and the wall 32 when the blade is in its outermost position to be forced forwardly, thus imparting rearward movement to the boat. ,.he blade 28 is oscillated toward and away from the wall 33 in the side 27 of the hull by means of a rod 3a which is pivoted at `its Buter end to a bracket 35, secured to the inner side of the blade. The rod 34 extends into the hull through a closely fitting aper ture in a cylinder 35 which is rotatably supported between two closely fitting concave bearing brackets 37 secured to the inside of the wall 33 ol' the housing 32. rlhe rod 34 connected in any suitable manner Vwithin the hull to the motor.

The reversing propellers ll7 in addition to being used together to impart rearward movenient .to the boat, may be `used separately to warp the stern of the boat to one side or the other.

l claim:

l. f r propelling device for boats, comprising a stationary blade, a movable blade pivoted substantially in the plane of the stationary blade for oscillation toward and away from the same, flanges extending perpendicularly from the `edges ofeachof the 4blades substantially in contiguity with each other, flanges extending reversely from thecedges of the flanges on one of the `blades aboutthc flanges .on the other of the blades, and means for effecting .oscillation `of the movable blade.

A propelling device for boats, coniprisf ing a stationary blade .of rearwardly increasing width, a movable blade Jof ,eorref sponding shape pivoted substantially in ,the plane oft the stationary blade for oscillation toward and away from the saine, flanges eX tending perpendieularly from fthe edges ,of cach ot the blades substantially in contigu.n ity with .each other, flanges Yextending kreversely from the edges of the flanges .on one of the blades about the flanges on the other of the blades, and means for 4effectingoscil.. lation of the movable blade.

8. A propelling Vdevice for boats, compris.- ing a housing positioned beneath the stern of the boat and provided with a short upper wall and a long lower wall in rearwardly Adiverging relation to the upper wall, a long blade pivoted adjacent the forward end of the housing on a horizontal axis for oscillation between the upper and lower walls, a laterally elongated bearing bracket secured `to the top .of the vblade rearwardly `of the upper wall, a link pivotedto the bracket, ,a guideway extending upwardly and forwardf ly from the housing, a fcross-head slidably mounted in .the .guideway rand pivoted to the link, and a reciprocating rod connected with.

the cross-head.

ln testimony whereof I have hereunto subscribed my nani-e.

AUGUST BRUN. 

